Vortex physics of unconventional superconductors : Ginzburg-Lindau theory

2000 ◽  
Author(s):  
Qunqing Li
Keyword(s):  
Unconventional Superconductors ◽  
Vortex Physics

scholarly journals Multiplicity, Parity and Angular Momentum of a Cooper Pair in Unconventional Superconductors of D4h Symmetry: Sr2RuO4 and Fe-Pnictide Materials

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1435
Author(s):  
Victor G. Yarzhemsky
Keyword(s):  
Angular Momentum ◽  
Cooper Pair ◽  
Point Group ◽  
Group Symmetry ◽  
Cooper Pairs ◽  
Group Approach ◽  
Angular Momentum Projection ◽  
Space Group ◽  
Unconventional Superconductors ◽  
Even Pairs

Sr2RuO4 and Fe-pnictide superconductors belong to the same point group symmetry D4h. Many experimental data confirm odd pairs in Sr2RuO4 and even pairs in Fe-pnictides, but opposite conclusions also exist. Recent NMR results of Pustogow et al., which revealed even Cooper pairs in Sr2RuO4, require reconsideration of symmetry treatment of its SOP (superconducting order parameter). In the present work making use of the Mackey–Bradley theorem on symmetrized squares, a group theoretical investigation of possible pairing states in D4h symmetry is performed. It is obtained for I4/mmm , i.e., space group of Sr2RuO4, that triplet pairs with even spatial parts are possible in kz direction and in points M and Y. For the two latter cases pairing of equivalent electrons with nonzero total momentum is proposed. In P4/nmm space group of Fe- pnictides in point M, even and odd pairs are possible for singlet and triplet cases. It it shown that even and odd chiral states with angular momentum projection m=±1 have nodes in vertical planes, but Eg is nodal , whereas Eu is nodeless in the basal plane. It is also shown that the widely accepted assertion that the parity of angular momentum value is directly connected with the spatial parity of a pair is not valid in a space-group approach to the wavefunction of a Cooper pair.

scholarly journals The Superconducting Critical Temperature

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 911
Author(s):  
Mike Guidry ◽  
Yang Sun ◽  
Lian-Ao Wu
Keyword(s):  
Critical Temperature ◽  
Dynamical Symmetry ◽  
Many Body ◽  
Unconventional Superconductors ◽  
The Many ◽  
Pair Coupling ◽  
Intrinsic Strength ◽  
Superconducting Transitions

Two principles govern the critical temperature for superconducting transitions: (1) intrinsic strength of the pair coupling and (2) the effect of the many-body environments on the efficiency of that coupling. Most discussions take into account only the former, but we argue that the properties of unconventional superconductors are governed more often by the latter, through dynamical symmetry relating to normal and superconducting states. Differentiating these effects is essential to charting a path to the highest-temperature superconductors.

Supercurrent tunneling between conventional and unconventional superconductors: A Ginzburg-Landau approach

1990 ◽  
Vol 41 (16) ◽  
pp. 11214-11228 ◽  
Author(s):  
S.-K. Yip ◽  
O. F. De Alcantara Bonfim ◽  
P. Kumar
Keyword(s):  
Ginzburg Landau ◽  
Unconventional Superconductors

scholarly journals Interplay between nematicity and Bardasis-Schrieffer modes in the short-time dynamics of unconventional superconductors

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Marvin A. Müller ◽  
Pavel A. Volkov ◽  
Indranil Paul ◽  
Ilya M. Eremin
Keyword(s):  
Time Dynamics ◽  
Unconventional Superconductors ◽  
Short Time

scholarly journals Rise and fall of Landau’s quasiparticles while approaching the Mott transition

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Andrej Pustogow ◽  
Yohei Saito ◽  
Anja Löhle ◽  
Miriam Sanz Alonso ◽  
Atsushi Kawamoto ◽  
...  
Keyword(s):  
Fermi Liquid ◽  
Mott Transition ◽  
Dynamical Localization ◽  
Strong Increase ◽  
Unconventional Superconductors ◽  
Scattering Rate ◽  
Complex Interactions ◽  
Liquid Behavior ◽  
Half Filling ◽  
Correlation Strength

AbstractLandau suggested that the low-temperature properties of metals can be understood in terms of long-lived quasiparticles with all complex interactions included in Fermi-liquid parameters, such as the effective mass m⋆. Despite its wide applicability, electronic transport in bad or strange metals and unconventional superconductors is controversially discussed towards a possible collapse of the quasiparticle concept. Here we explore the electrodynamic response of correlated metals at half filling for varying correlation strength upon approaching a Mott insulator. We reveal persistent Fermi-liquid behavior with pronounced quadratic dependences of the optical scattering rate on temperature and frequency, along with a puzzling elastic contribution to relaxation. The strong increase of the resistivity beyond the Ioffe–Regel–Mott limit is accompanied by a ‘displaced Drude peak’ in the optical conductivity. Our results, supported by a theoretical model for the optical response, demonstrate the emergence of a bad metal from resilient quasiparticles that are subject to dynamical localization and dissolve near the Mott transition.

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